CN1038169A - Detect the method and apparatus of short-circuit between sheets of pile sheet cores - Google Patents

Detect the method and apparatus of short-circuit between sheets of pile sheet cores Download PDF

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Publication number
CN1038169A
CN1038169A CN89103797A CN89103797A CN1038169A CN 1038169 A CN1038169 A CN 1038169A CN 89103797 A CN89103797 A CN 89103797A CN 89103797 A CN89103797 A CN 89103797A CN 1038169 A CN1038169 A CN 1038169A
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coil
sheet
short
measuring
laminated core
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Expired - Lifetime
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CN89103797A
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CN1012286B (en
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兹勒蒂米尔·波西德尔
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General Electric Switzerland GmbH
ABB AG Germany
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Asea Brown Boveri AG Switzerland
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Electrochemistry (AREA)
  • Pathology (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Basic Packing Technique (AREA)
  • Laminated Bodies (AREA)

Abstract

For in short circuit between foil detector (8) in the laminated core, laminated core (1) is subjected to the magnetization of an ancillary coil.Iron surface (15) has two by one and separates aspect electric, surveys and the slotted line coil apparatus (5) of mechanically interconnected coil (6,7) is flat.In the measuring instrument (9) of a serial connection, the output signal of coil is compared mutually; When between sheet during short circuit, the fault current by the short circuit iron plate indicates the voltage that out of phase is moved in coil, and this voltage adaptable is by the position and the big small connect ground of short circuit between sheet.

Description

Detect the method and apparatus of short-circuit between sheets of pile sheet cores
The present invention relates to a kind of method that detects short circuit between the motor laminated core sheet, in this method, utilize an auxiliary winding that laminated core is magnetized, surface unshakable in one's determination is then surveyed with a slotted line coil apparatus that the measurement instrument of serial connection is housed.
The invention still further relates to a kind of equipment of implementing this method.
The present invention originates from a kind of prior art, as 1/2 of AT-magazine " ELIN magazine " 1984, is narrated in a section ' the magnetic shunt path location in the stator core ' that publishes on the 58th page.
The stator core of stacked stator core, particularly motor is adopted the measuring method of stator core ring excitation during fabrication and in the maintenance of run duration, comes short circuit between detection lug with specified induction.This method demonstrates in the effect of short-circuit current between sheet under the local temperature difference, but requires have powerful and high-voltage power supply and heavy in section field coil that can adjust.
For the stator core sheet of dress winding rod in having, can only recognize in the lip-deep defective locations of crown (short circuits between many iron cores) with this detection method, and can not recognize iron plate defective in bottom land and groove side.Can only discern short circuit between the sheet that has certain contact resistance and therefore produce local temperature difference with this method, rather than location of short circuit between all sheets.And raise simply by virtue of temperature and to be not sufficient to location of short circuit between sheet is made quantitative judgement.
The defective of common iron plate context of detection can with aforementioned " ELIN magazine " announce under the induction of the yoke a little less than in the of by sheet between the measuring method that constitutes of short-circuit current field avoid.Magnetization for laminated core only needs a low-tension supply.Like this, short circuit can both be found out between in fact nearly all sheet, also comprises short circuit between those sheets that are positioned at trough rim or bottom land.In addition, the state that also comprises boring control surface (also the comprising rooved face) laminated insulation of whole pole shoe.Unshakable in one's determination can the detection with the rotor of interior dress.This known method can be carried out qualified analysis to the position of short circuit between sheet.The efficient that iron plate in the cards is repaired just can be controlled immediately at an easy rate.In addition, can also make comparisons to the laminated core state of many motors.The variation of the laminated core in time course and aging just can be determined.
But disadvantageously: for a laminated core-defective locations, its measured value reading of reading is directly proportional with fault current (" cause "), and be not directly proportional with the overtemperature of the appearance that is in operation (" consequence ").But, because " cause " and " consequence " sheerly relation rather than simple subordinate relation of physics, therefore just must could explain the result of measurement by means of some experiences.The explanation of the measured value reading that shows do not had problem, therefore here,, this measured value reading that demonstrates all is to derive from defective, what difficulty was explained is the measured value reading of diffusion, because this both was related to the heterogeneity that " focus " also is related to laminated core.
For the measured value reading is consistent with entirely different laminated core type quantitatively, will when measuring beginning, each all carry out relative calibration.The subsection of laminated core quilt short circuit outwardly when connecting excitation (calibration error point), and to this registration measured value reading.For the stator core defective reading of a reality,, can therefrom infer the size of actual defects according to ongoing relative calibration.
From prior art, task of the present invention is to formulate out a kind of method that does not have the detection short-circuit between sheets of pile sheet cores of aforesaid drawbacks, in this method, needn't carry out procedural relative calibration, just can draw the quantitative conclusion of position of failure point and size intact or calibration flaw position.
Another task of the present invention just provides a kind of equipment of carrying out this method.
According to the present invention, this task is to solve like this, promptly, by utilize at least two aspect the electricity separately and radially separate, but mechanically interconnective measurement coil, just can be from measure coil the phase differential of induced voltage and/or the radial distribution that amplitude variations is found out the magnetic field of short-circuit current between sheet.
The corresponding apparatus that is used to implement this method comprises: one is used for ancillary coil that laminated core is magnetized, one has two and separates aspect electric, but the measuring probe of interconnective again measurement coil in the mechanism, one is connected phasing degree deviation and/or the measuring equipment of amplitude variations and the record cell of a serial connection that is used for grasping on the measurement coil measuring the coil induced voltage.
To do more detailed explanation to the present invention with reference to the accompanying drawings below.
Fig. 1 illustrates the schematic diagram of the ring-type excitation of stator core;
Fig. 2 illustrates the summary of measuring coil position;
The sectional view of the measuring equipment of Fig. 3 on two stator tooths, and with the respective vectors figure in unimpaired stator core;
Fig. 4 but arrangenent diagram when having between sheet short circuit similar to Fig. 3;
Fig. 5 is used to produce the arrangenent diagram of reference signal and has corresponding polar plot;
The schematic diagram of Fig. 6 measuring equipment is together with its unit connection layout;
Fig. 7 represents the curve map that phase differential changes.
The stator core 1 of a motor utilizes a coil 2 around stator core to make it faintly magnetize (Fig. 1) with the excitation of the ring-type in the common measurement.Yoke induction in this measures only accounts for about 5-10% of specified induction.To the power supply of inductive coil, the low pressure networking is just enough.The ring-type magnetization preferably realizes by an autotransformer (adjusting transformer) 3 of receiving the adjustable output voltage on the low pressure networking.By the reactive-current compensation of shnt capacitor 4, feed current I may take place QMinimizing.Maximum feed current is approximately 20A in this measures.
Usually it is different therewith with the iron plate detection of specified yoke induction (infrared camera is manually surveyed) to be noted in the heating of short circuit between sheet (" focus "), in the method, the surface of laminated core has a coil device 5, this device comprises that two link mutually firmly, but radially mutual again measurement coil 6 of isolating, 7, determine the radial distribution (Fig. 2 and 3) in the magnetic field of short-circuit current between sheet by it.Measure in the termination of measuring coil 6,7 the voltage U that does not have the iron core of short circuit between sheet M1, U M2Be with coil end between magnetic potential or be directly proportional with magnetization current.Measure coil and therefore be used as the magnetic voltage table (" Rogovski coil ") of measuring line integral between the coil end.Two measure angle between the coil induced voltages equal zero (Fig. 3).When short circuit 8 takes place between sheet when, fault current I FBy the iron plate of short circuit, in measurement coil 6,7, induce the voltage that out of phase is moved.
Figure 891037977_IMG2
Measure coil the 6, the 7th, to the inductive coil of fault current, this coil is at the different magnetic induction B that measure fault current in the radial direction of laminated core FWhereby, when having short circuit 8 between sheet, between the voltage of measuring coil 6,7, just produced phase shift △ α (seeing the polar plot of Figure 4 and 5).
The phase shift of the measuring voltage that is caused by fault current is to decide with the size and the circuit length of short-circuit current between sheet.Strengthen measuring the voltage of coil 6,7, and determine the phasing degree deviation △ α and/or the amplitude variations △ φ (Fig. 6) of measuring voltage with a phase detector 9.
Preferably pack one into movably on the carrier 10, utilize rope drive and CD-ROM drive motor 11 can make it along notch from laminated core an end of 1 and move to the other end measuring coil 6,7.Selsyn transmitter that is connected with CD-ROM drive motor 11 or displacement transducer 12 can make it grasp carrier, and the axial location of slotted line coil apparatus 5 thereupon.
The phase deviation △ α and/or the amplitude variations △ φ of the measuring voltage that causes by the iron plate electric current can give record with a series of lines (each bar line is represented a notch) with an X-Y recorder 13.
To make comparisons along notch signal of noting and the signal that is equivalent to the iron plate electric current.Article one, make with thin conductor, and have and sheet between the loop line 14 of short circuit same widths 16 be fixed on the crown surface 15 and feedback with and sheet between short-circuit current suitable electric current (Fig. 5).
Short-circuit current is to carry out feed by the autotransformer of receiving in the networking 3 between sheet.From short-circuit current between the sheet of short circuit iron plate is to be determined by the impedance of the known voltage value between the iron plate and individual iron plate.The signal (△ α) of measuring coil then together with do not connect this line current and write down (△ α E) respectively, and and sheet between the signal (△ α F) of short-circuit current compare (Fig. 7).
If without rope drive, carrier also can be made into pancake support of walking voluntarily, and like this, according to Fig. 6, its CD-ROM drive motor is connected to grasp the distance that it travels with a displacement transducer or selsyn transmitter.
Method recited above also can be used for the detection of stator core for the motor of cartridge rotor in having.But in this case, rotor must insulate with ground fully at an end of motor, as common big generator.
An axle on-insulated at the two ends of motor is as a secondary short circuited winding, because the coupling of good magnetic force, still can be under weak excitation situation by the electric current of hundreds of ampere.The axle of motor one end whether not tape insulation can and measure shaft voltage over the ground at non-driving one end of motor and cling to ü  a kind of bamboo Gou that coils approximately and kowtow the still  thumb just right even model ā of the sound of sth. throbbing or bursting news  of   chessboard footpath between fields that vomits of sedan-chair ㄗ with a Rogovski coil measurement axis electric current
Under the motor situation of cartridge rotor, particularly big turbine, the best feed power supply by a heavy current that magnetizes of its stator core realize that this power supply links to each other with the axle of insulation between the two ends of motor in having.

Claims (7)

1, detects the method for short circuit between motor laminated core (1) sheet, in this method, laminated core (1) utilizes an auxiliary winding (2) with its magnetization, surface unshakable in one's determination is then with a slotted line coil apparatus (MS1 that the measurement instrument (9) of serial connection is housed, MS2) surveyed, it is characterized in that: by utilize at least two aspect electric separately and radially separate, but mechanically interconnective again measurement coil (6,7) just can be from measuring coil (6,7) (UM1, phase differential UM2) and/or amplitude variations are found out short-circuit current (I between sheet to induced voltage in F) the radial distribution in magnetic field.
2, according to the method for claim 1, it is characterized in that: just can find out the phase differential (△ α) of measuring coil (6,7) signal by a phase detector (9).
3, according to the method for claim 1, it is characterized in that: grasp the difference of vibration (△ φ) of measuring coil (6,7) signal with a register (13).
4, according to each method among the claim 1-3, it is characterized in that: with the signal noted and be equivalent between sheet the signal of short-circuit current and make comparisons, here the loop line of a respective width (14) is fixed on the iron plate surface (15), and feedback is with short-circuit current between corresponding sheet.
5, according to each method among the claim 1-4, it is characterized in that: measure coil (6,7) and be installed on the carrier (10), and utilize a CD-ROM drive motor (11) to make it to shift to the other end from an end along (1) unshakable in one's determination.
6, according to each method among the claim 1-5, it is characterized in that: magnetizing of (1) unshakable in one's determination is that feed current by a heavy current realizes that by armature spindle this power supply links to each other with the axle of insulation between the two ends of motor.
7, be used to implement equipment according to the method for claim 1, it is characterized in that: one is used for ancillary coil (2) that laminated core (1) is magnetized, one has two and separates aspect electric, but mechanically interconnective measurement coil (6,7) slotted line coil apparatus (5), one is connected on the measurement coil, is used for grasping and is measuring coil induced voltage (UM1, the measuring equipment (9) of phasing degree deviation UM2) and/or amplitude variations, and a record cell (13) that is connected on the measuring equipment.
CN89103797A 1988-05-30 1989-05-30 Method and apparatus for detecting short-circuit between sheets of pile sheet cores Expired CN1012286B (en)

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CH2043/88A CH676526A5 (en) 1988-05-30 1988-05-30
CH2043/88-1 1988-05-30

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US (1) US4996486A (en)
EP (1) EP0344558B1 (en)
JP (1) JP3119854B2 (en)
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AT (1) ATE102354T1 (en)
CH (1) CH676526A5 (en)
DE (1) DE58907060D1 (en)

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CN103149490A (en) * 2011-12-06 2013-06-12 阿尔斯通技术有限公司 Method for ascertaining a short-circuit in a stator core
CN103293430A (en) * 2013-05-08 2013-09-11 南车戚墅堰机车有限公司 Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores
CN103348241A (en) * 2011-02-11 2013-10-09 西门子能量股份有限公司 Fault detection for laminated core
CN103430017A (en) * 2011-02-11 2013-12-04 西门子能量股份有限公司 Fault detection for laminated core
CN108446399A (en) * 2018-03-29 2018-08-24 重庆大学 A kind of dynamic memory optimization method of structuring magnanimity real time data

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CN103430017A (en) * 2011-02-11 2013-12-04 西门子能量股份有限公司 Fault detection for laminated core
CN103149490A (en) * 2011-12-06 2013-06-12 阿尔斯通技术有限公司 Method for ascertaining a short-circuit in a stator core
CN103293430A (en) * 2013-05-08 2013-09-11 南车戚墅堰机车有限公司 Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores
CN103293430B (en) * 2013-05-08 2015-06-24 南车戚墅堰机车有限公司 Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores
CN108446399A (en) * 2018-03-29 2018-08-24 重庆大学 A kind of dynamic memory optimization method of structuring magnanimity real time data
CN108446399B (en) * 2018-03-29 2021-07-30 重庆大学 Dynamic storage optimization method for structured massive real-time data

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CH676526A5 (en) 1991-01-31
JP3119854B2 (en) 2000-12-25
EP0344558A2 (en) 1989-12-06
EP0344558B1 (en) 1994-03-02
EP0344558A3 (en) 1992-04-15
CN1012286B (en) 1991-04-03
JPH0225766A (en) 1990-01-29
US4996486A (en) 1991-02-26
ATE102354T1 (en) 1994-03-15
DE58907060D1 (en) 1994-04-07

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